Burglars only taking part in crime (5)
I believe the answer is:
arson
'crime' is the definition.
(crime of illegally starting a fire)
'burglars only taking part' is the wordplay.
'taking part' indicates the answer is hidden within the clue.
'ARSON' can be found hidden inside 'burglars only'.
'in' is the link.
(Other definitions for arson that I've seen before include "Iniquitous behaviour" , "Felonious burning of property" , "burning problem" , "A burning crime" , "serious offence" .)