Crossword Genius

Grimace and confront second tug first (4,5)

Ross

I believe the answer is:

pull faces

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'tug first' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'grimace and confront second' is the wordplay.
'grimace' becomes 'pull' (I am not sure about this - if you are sure you should believe this answer much more).
'and' means one lot of letters go next to another.
'confront' becomes 'face' (synonyms).
'second' becomes 's' (common abbreviation).
'pull'+'face'+'s'='PULL FACES'

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I've seen this clue in The Daily Express.
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