Crossword Genius

Twice appears as understudy (6)

Ross

I believe the answer is:

double

This clue is a double definition.

'twice' is the first definition.
(synonyms)

'understudy' is the second definition.
(I've seen this before)

'appears as' acts as a link.

(Other definitions for double that I've seen before include "Make twice as many" , "with which darts player gets leg over?" , "Multiply by two" , "Score of forty with one dart, perhaps?" , "Second charge for the same offence" .)

I've seen this clue in The Globe and Mail.
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