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Hello, stuck on this lot.

5a Fancy trousers, back to front and extremely ticklish (7)
s-r----.
I can't get strewth out of my head, but can only make the last two letters work.

8d Why we leave wife with an upset animal (5)
Hyena maybe, but again can only parse the last two letters.

47d Initially act upon Morse's sound assessment (5)
Audit fits, but can't see why apart from the 'a' from initially act.

3 Strewth - Fancy!

Trews - back letter to front + t(icklis)h

45 a(ct) u(p) + Dit

Morse code - dit,dah sounds

8 (w)hy (w)e + an, up

leave out w(ife)

Thank you Mamya, haven't heard of dit, dah for the sound of Morse.