Spooner's to stuff seamen in transport (8)
I believe the answer is:
tramcars
'transport' is the definition.
(I have seen 'public transport' mean 'tramcars' so perhaps 'transport' could also mean 'tramcars')
'spooner's to stuff seamen in' is the wordplay.
'spooner' becomes 'c' (I can't justify this - if you can you should believe this answer much more).
'to' means one lot of letters go next to another (I've seen this in other clues).
'stuff' becomes 'ram' (ramming is a kind of stuffing).
'seamen' becomes 'tars' (tar can mean a sailor).
'in' is an insertion indicator.
'c' after 'ram' is 'ramc'.
'ramc' inserted into 'tars' is 'TRAMCARS'.
Can you help me to learn more?
(Another definition for tramcars that I've seen is " public transport".)