With inward feet, slob takes long time to execute dance at first (6-4)

I believe the answer is:

pigeon-toed

'with inward feet' is the definition.

'slob takes long time to execute dance at first' is the wordplay.
'slob' becomes 'pig' (synonyms).
'takes' means one lot of letters go next to another.
'long time' becomes 'eon' (eon is a kind of long time).
'at first' indicates taking the first letters.
The first letters of 'execute dance' is 'ed'.
'pig'+'eon'+'to'+'ed'='PIGEON-TOED'

I've seen this clue in The Everyman puzzle in The Observer.

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