Official dealing with loose pockets back in time (7)
I believe the answer is:
referee
'official' is the definition.
(referee is a kind of official)
'dealing with loose pockets back in time' is the wordplay.
'dealing with' becomes 're' (regarding).
'loose' becomes 'free' (similar in meaning).
'pockets' indicates putting letters inside.
'back in' indicates one should take the final letters (the 'back' of the word).
The last letter of 'time' is 'e'.
'free' enclosing 'e' is 'feree'.
're'+'feree'='REFEREE'
(Other definitions for referee that I've seen before include "Football official" , "Official to ensure fair play" , "Judge" , "Sports official" , "Match official" .)