Look weary and turn up the gas (3)
I believe the answer is:
sag
'look weary' is the definition.
I can't judge whether this defines the answer.
'turn up the gas' is the wordplay.
'turn up' shows that the letters should be reversed in order.
'gas' back-to-front is 'SAG'.
'and' is the link.
Can you help me to learn more?
(Other definitions for sag that I've seen before include "Hang down loosely" , "Give way under pressure" , "Slump" , "Droop, sink in the middle" , "Sinking" .)