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Back up for short drama, that's important … (4,1)

Ross

I believe the answer is:

plan b

'back up' is the definition.
(a back-up plan)

'short drama that's important' is the wordplay.
'short' means to remove the last letter.
'drama' becomes 'play' (synonyms).
'that's important' becomes 'NB' (short for nota bene, noting something important).
'play' with its final letter removed is 'pla'.
'pla'+'nb'='PLAN B'

'for' is the link.

I've seen this clue in The Guardian.
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