Notice wine making a comeback in summer (5)
I believe the answer is:
adder
'summer' is the definition.
(someone who adds or does sums)
'notice wine making a comeback' is the wordplay.
'notice' becomes 'ad'.
'wine' becomes 'red' (red wine is a kind of wine).
'making a comeback' shows that the letters should be reversed in order.
'red' backwards is 'der'.
'ad'+'der'='ADDER'
'in' is the link.
(Other definitions for adder that I've seen before include "Poisonous Brit. snake" , "exhibit in the reptile house" , "venomous creature" , "Mathematical reptile" , "British snake; summer" .)