Seat that's too low? Not entirely (5)

I believe the answer is:

stool

'seat' is the definition.
(I know that seat can be written as stool)

'that's too low? not entirely' is the wordplay.
'not entirely' indicates a hidden word.
'STOOL' can be found hidden inside 'thats too low'.

(Other definitions for stool that I've seen before include "Three-legged backless seat" , "Motion" , "Backless chair" , "Small seat" , "Simple seat" .)

I've seen this clue in the Best For Puzzles.

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