Gobsmacked when port's said to be lacking fruit (4,10)

'gobsmacked' is the definition.

'when port's said to be lacking fruit' is the wordplay.
I cannot quite understand how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
'said' could be 't' (I've seen this in other clues) and 't' is present in the answer.
'port' could be 'p' and 'p' is present in the answer.
This explanation may well be incorrect...