Tax period (7)

I believe the answer is:

stretch

I believe this is a double definition.

'tax' is the first definition.
(I've seen this before)

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

(Other definitions for stretch that I've seen before include "Make demands on; continuous expanse" , "Exaggerate" , "Bit of exercise" , "Spell of time (in prison?)" , "Exercise - period" .)

I've seen this clue in The Times.

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