Month in Guernsey and Jersey, say -- or here (5)
I believe the answer is:
capri
'jersey say or here' is the definition.
The definition suggests a singular noun which matches the answer.
'month in guernsey' is the wordplay.
'month' becomes 'apr' (abbreviation for April).
'in' is an insertion indicator.
'guernsey' becomes 'ci' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'apr' placed inside 'ci' is 'CAPRI'.
'and' is the link.
Can you help me to learn more?
(Other definitions for capri that I've seen before include "holiday destination" , "Romantic and expensive island in Bay of Naples" , "Island off Italy" , "Location for holiday" , "Tourist destination" .)