Curse witches wearing clothes (5)
I believe the answer is:
swear
'curse' is the definition.
(synonyms)
'witches wearing clothes' is the wordplay.
'clothes' indicates a hidden word (the letters clothe the hidden word).
'SWEAR' can be found hidden inside 'witches wearing'.
(Other definitions for swear that I've seen before include "Vow, attest" , "Eff and blind" , "Assert" , "Affirm" , "Emit oath or take vow" .)