Frequently at zero feet (3)
I believe the answer is:
oft
'frequently' is the definition.
(I've seen this before)
'at zero feet' is the wordplay.
'at' says to put letters next to each other.
'zero' becomes 'o'.
'feet' becomes 'ft' (I've seen this in other clues).
'o'+'ft' is 'OFT'.
(Other definitions for oft that I've seen before include "(In poetry) frequently" , "Many times, to the poet" , "''... in the stilly night'' (Moore melody)" , "Old song'... in the stilly night'" , "(Poetically) frequently" .)