Trained, it's said, to be very tight (4)

I believe the answer is:

taut

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'very tight' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

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(Other definitions for taut that I've seen before include "Held in tension" , "Stretched tight or disciplined" , "seaworthy" , "Fully stretched" , "Pulled or drawn tight" .)

I've seen this clue in The Telegraph.

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