Son steal? Caught in police surveillance? (8)
I believe the answer is:
stakeout
'police surveillance?' is the definition.
(I've seen this before)
'son steal? caught' is the wordplay.
'son' becomes 's'.
'steal?' becomes 'take' (to steal is to take without permission).
'caught' becomes 'out'.
's'+'take'+'out'='STAKEOUT'
'in' is the link.
(Other definitions for stakeout that I've seen before include "Put under surveillance - like statue, OK?" , "Police surveillance assignment" , "watch closely" , "Act of surveillance" , "Secret surveillance by police" .)