Sufficient number in survey? Not initially (5)
I believe the answer is:
ample
'sufficient' is the definition.
(both can mean enough)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ample that I've seen before include "Bulky" , "Large, accommodating" , "Copious - abundant" , "Full-figured" , "Fully enough" .)