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Ache? Feel no pain, recovering altogether finally (4)

Ross

I believe the answer is:

long

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'ache?' is the definition.
('long' can be a synonym of 'ache')

I cannot understand how the rest of the clue works.

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(Other definitions for long that I've seen before include "Extensive - pine" , "extended period" , "Sustained" , "Protracted" , "to be tall" .)

I've seen this clue in The Hindu.
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