Police inspector taking a crafty peep in port (6)
I believe the answer is:
dieppe
'port' is the definition.
(I've seen this before)
'police inspector taking a crafty peep' is the wordplay.
'police inspector' becomes 'di' (I can't explain this - if you can you should believe this answer much more).
'taking' means one lot of letters go next to another.
'a crafty' is an anagram indicator.
'peep' with letters rearranged gives 'eppe'.
'di'+'eppe'='DIEPPE'
'in' is the link.
Can you help me to learn more?
(Other definitions for dieppe that I've seen before include "Port of N. France" , "Fr port, resort on Channel" , "French town" , "Channel port in northern France" , "N. French port" .)