Tip: with rain ahead, one must wear anorak (9)
I believe the answer is:
pourboire
'tip' is the definition.
(I've seen this before)
'with rain ahead one must wear anorak' is the wordplay.
'with' is a charade indicator (letters next to each other).
'rain' becomes 'pour' (pouring is a kind of raining).
'ahead one must wear anorak' becomes 'boire' (I can't justify this - if you can you should give a lot more credence to this answer).
'pour'+'boire' is 'POURBOIRE'.
Can you help me to learn more?
(Other definitions for pourboire that I've seen before include "Tip" , "Gratuity" .)
