Six-footer from Grantham (3)

I believe the answer is:

ant

'six-footer' is the definition.
(ants have six feet)

'from grantham' is the wordplay.
'from' indicates a hidden word.
'ANT' is hidden in the letters of 'grantham'.

(Other definitions for ant that I've seen before include "Proverbially hard-working insect" , "Emmet or pismire" , "Dec's long-time partner" , "One working hard" , "The insect lives in a social colony" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app