Expanded, as the former did all round (7)
I believe the answer is:
dilated
'expanded' is the definition.
('dilated' can be similar in meaning to 'expanded')
'the former did all round' is the wordplay.
'the former' becomes 'late'.
'all round' means one lot of letters goes inside another.
'late' going within 'did' is 'DILATED'.
'as' is the link.
(Other definitions for dilated that I've seen before include "like pupils in the dark" , "Became more open" , "Spoke at length" , "Widened; expanded" , "Made more open" .)