Police officer in boat is wise person (6)
I believe the answer is:
pundit
'wise person' is the definition.
'pundit' can be an answer for 'person' (pundit is a kind of person). I am unsure of the 'wise' bit.
'police officer in boat' is the wordplay.
'police officer' becomes 'di' (abbreviation for Detective Inspector).
'in' means one lot of letters goes inside another.
'boat' becomes 'punt' (type of boat).
'di' placed inside 'punt' is 'PUNDIT'.
'is' is the link.
Can you help me to learn more?
(Other definitions for pundit that I've seen before include "Expert (sometimes self-appointed)" , "A learned type" , "Learned Hindu or general expert" , "A learned Hindu or expert generally" , "Pontificating expert" .)