Suggest just ignoring son (5)
I believe the answer is:
imply
'suggest' is the definition.
(implying is a kind of suggesting)
'just ignoring son' is the wordplay.
'just' becomes 'simply' (I've seen this before).
'ignoring' is a deletion indicator.
'son' becomes 's'.
'simply' with 's' taken away is 'IMPLY'.
(Other definitions for imply that I've seen before include "Insinuate, hint" , "State indirectly" , "Infer" , "Involve - intimate" , "Intimate, suggest indirectly" .)