Trailer on truck with electronic ID first to benefit (9)
I believe the answer is:
advantage
'to benefit' is the definition.
(thesaurus)
'trailer on truck with' is the wordplay.
'trailer' becomes 'ad' (I've seen this in other clues).
'on' is a charade indicator (letters next to each other).
'truck with' becomes 'vantage' (I can't explain this - if you can you should give a lot more credence to this answer).
'ad'+'vantage'='ADVANTAGE'
'electronic id first' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for advantage that I've seen before include "Benefit - superior position" , "First point scored after deuce in tennis" , "Profit, tennis score" , "Asset" , "Benefit, profit" .)