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I have completed the grid and it seems to me that a defect of the puzzle is that there is no need to solve any thematic clues.

I have solved 7 but can someone help me to solve these 3 (I know their entries)?
19d Study of books initially altered title (8)
27d Seek liqueur society rejected (6)
28d Fool upset prudent man in dicing game (6)

I had given up on the thematic clues once I had the entries.
28d answer is old dicing game formed by reverse of fool followed by prudent man. 7 letters.
Will look again at other two
One evades me - 29d where I have *RAGA - any hint? Should be a normal clue.

Ionexch, 'support' is just one of the normal words used in crossword clues.

Yes, I agree, it was a defect with the puzzle. And by not ensuring that all of the answer lengths matched the substituted entry lengths the setter cheated (in my opinion). At the very least the preamble should have stated that numbers in brackets refer to entry lengths. A pity because it spoilt an otherwise enjoyable crossword for me.
19d HEADING - (r)EADING = 'study of books'
27d CHASE - CHAS(s)E = 'liqueur'
28d PASSAGE - PAS = 'sap'/'Fool upset' + SAGE (entry for 'passage' in chambers refs the'dicing game').

I meant ' supporter'

cloverjo - I had the three letter supporter and the city from the beginning but the way I printed out the crossword I didn't see " government in foreign city". Makes it much harder!

Full grid, but cannot figure out one thematic clue answer, although I do have a possibility. Help please.
7ac: Amiable people generally engaged in company

1a Heartless media blocked by bad-tempered person's movement
33a Wild sheep retreat over in south america
23a Foreign system of rules includes latest ideas from Japan

23 Ethnic, foreign. Ethic, system of rules, with the N the last letter, 'latest from Japan' (so I assumed the 'ideas' was extra).

33 Urials, wild sheep. Lair - retreat, over/reversed so Rial, inside US, America.
I didn't get 1 A.