I have what I wore, and miss fencing attempt (4,2,1,5)
I believe the answer is:
give it a whirl
'attempt' is the definition.
(giving it a whirl is a kind of attempting)
'i have what i wore and miss fencing' is the wordplay.
'i have' becomes 'I've' (contraction of 'I have').
'wore' is an anagram indicator (I've seen 'wearing' mean this (wear can mean to become damaged)).
'and' is a charade indicator (letters next to each other).
'miss' becomes 'girl' (synonyms).
'fencing' indicates putting letters inside (to fence can mean to contain or put a limit round).
'what'+'i'='whati'
'whati' is an anagram of 'itawh'.
'ive'+'itawh'='iveitawh'
'iveitawh' going within 'girl' is 'GIVE IT A WHIRL'.
(Another definition for give it a whirl that I've seen is " Try something".)