Many thanks Chrise and Jazzgirl.
Inuit and Trendy - me and wood and trees as per.
Further research/thought reveals this:-
"SPAR" in "SONGSPARROW" - OED online (via my local library) lists "spar" for "check" (verb), hence (check)"mate". New to me.
ISSEI is correct - ISSUE = PROFITS (Chambers, also new to me!), take out "U" as you say and add i' which is short form of in (as in "in short") as used in Shakespeare &c.
1,000 thanks again!