Crossword Genius

Look weary and turn up the gas (3)

Ross

I believe the answer is:

sag

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'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" .)

I've seen this clue in the Evening Standard.
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