Crossword Genius

More than a foot behind (5)

Ross

I believe the answer is:

after

I'm a little stuck... Click here to teach me more about this clue!

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

'more than a foot' is the wordplay.
I cannot quite see how this works, but
'a' is found in the answer.
'foot' could be 'ft' (synonyms) and 'ft' is found in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for after that I've seen before include "Coming later in time" , "Searching for" , "In pursuit of, behind" , "Following, consequent to" , "In honour of" .)

I've seen this clue in the Evening Standard.
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