In great numbers (6)
I believe the answer is:
galore
'in great numbers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for galore that I've seen before include "'Whisky ------!', classic Ealing comedy of 1949" , "Existing in great numbers" , "abundantly" , "Lots of" , "Aplenty" .)