Delivery work by said masculine doctor (4,4)
I believe the answer is:
mail drop
'delivery' is the definition.
(I've seen this before)
'by said masculine doctor' is the wordplay.
'by' says to put letters next to each other.
'said' indicates a 'sounds like' (homophone) clue.
'masculine' becomes 'male' (associated in meaning).
'doctor' becomes 'drop' (I can't explain this - if you can you should give a lot more credence to this answer).
'male' sounds like 'mail'.
'mail' put next to 'drop' is 'MAIL DROP'.
'work' acts as a link.
This may not be correct. It may belong to another bit of the clue.
(Other definitions for mail drop that I've seen before include "Postal delivery" , "post-delivery" , "Letters" , "post finally obtained here in America?" .)