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Stuck on last 2, any help is appreciated.
21a. Ego swollen bachelor goes to front, fond of drink (8)
bi?u???s. I have got bibulous as an answer but cannot see why.
22d. Work with a pair of rulers that's more puzzling (7)
??a?u?r

ego: I
swollen: BULBOUS
the second B goes to the front

ego: I
swollen: BULBOUS
the second B goes to the front

21 I (ego) and bulbous (swollen) with the b (bachelor) moving to the front

op a qu er

OP A QU ER

many thanks chelle and Aristophanes.

driven to or marked by the consumption of alcohol; "a bibulous fellow"; "a bibulous evening"; "his boozy drinking companions"; "thick boozy singing"; "a drunken binge"; "two drunken gentlemen holding each other up"; "sottish behavior"