Weather when fish will take line and bite? (4,4)
I believe the answer is:
cold snap
'weather' is the definition.
(cold snap is a kind of weather)
'fish will take line and bite?' is the wordplay.
'fish' becomes 'cod' (cod is a kind of fish).
'will take' is an insertion indicator.
'line' becomes 'l'.
'and' means one lot of letters go next to another.
'bite?' becomes 'snap' (I've seen this before**).
'cod' placed around 'l' is 'cold'.
'cold'+'snap'='COLD SNAP'
'when' is the link.
(Other definitions for cold snap that I've seen before include "Short period of wintry weather" , "Short spell of severe frost" , "when snow may fall?" , "Brief spell of freezing weather" , "Frosty spell" .)