Loose garment clothing back in fashion all round (5)
I believe the answer is:
tunic
'loose garment clothing' is the definition.
'tunic' can be an answer for 'clothing' (tunic is a kind of clothing). I am not sure about the 'loose garment' bit.
'back in fashion all round' is the wordplay.
'back' shows that the letters should be reversed in order.
'fashion' becomes 'cut' (cut is a kind of fashion).
'all round' is an insertion indicator.
'in' inserted inside 'cut' is 'cinut'.
'cinut' back-to-front is 'TUNIC'.
Can you help me to learn more?
(Other definitions for tunic that I've seen before include "Loose fitting light cloak extending to the hip or lower" , "Cut in (anag)" , "Roman garment" , "Clobber" , "Close-fitting jacket that's part of a uniform" .)