Sun Tel Cryptic 2623

[chokkie]

Stuck on a few ....
20d composer attacked by insects, crossing river (7) ??i?l?n
21d Mug putting most of capital into trust fund ultimately (7) ??e?a?d
25a a river that is extremely short of water (7) a?i?e?a

Many thanks, CHox.

[Lie-in King]

20d B-r-itten
21d Tankard - 'Ankar(a) (in) '(trus)t (fun)d' (ultimate letters of)
25a A-r-id est (ie [that is] in full)

[jwlswann]

25a Aridest
20d Britten
21d Tankard

[Zhukov]

Tankard

[chokkie]

Many thanks everyone, all done now. appreciate your help. Hope you enjoy the rest of your Sunday. Chox.