See a sailor taking a taxi (3)
I believe the answer is:
cab
'taxi' is the definition.
(I know that taxi can be written as cab)
'see a sailor taking a' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'sailor' becomes 'ab' (abbreviation for able seaman).
'taking' suggests deleting specific letters (take can mean remove or delete).
'ab' with 'a' taken out is 'b'.
'c'+'a'+'b'='CAB'
(Other definitions for cab that I've seen before include "Organisation to collect money made from crime" , "It has the authority to confiscate the proceeds of crime, in short" , "Taxi to hold an engine-driver" , "Hired car" , "Driving compartment" .)