Police officer brought in pink drink (7)
I believe the answer is:
cordial
'drink' is the definition.
(cordial is a kind of drink)
'police officer brought in pink' is the wordplay.
'police officer' becomes 'DI' (abbreviation for Detective Inspector).
'brought in' means one lot of letters goes inside another.
'pink' becomes 'coral' (coral is a shade of pink).
'di' placed into 'coral' is 'CORDIAL'.
(Other definitions for cordial that I've seen before include "Friendly; fruit drink" , "7 [HEARTY]" , "stimulating drink" , "Affable type of sweet drink?" , "Hearty, affectionate" .)