One's trapped by the female burglar (5)
I believe the answer is:
thief
'burglar' is the definition.
(I've seen this before)
'one's trapped by the female' is the wordplay.
'one' becomes 'i' (Roman numeral).
'trapped by' is an insertion indicator.
'female' becomes 'f' (abbreviation).
'i' going inside 'the' is 'thie'.
'thie'+'f'='THIEF'
(Other definitions for thief that I've seen before include "One who steals" , "Burglar, say" , "A robber or pickpocket" , "nicker?" , "Afternoon break" .)