Leader of pack with lots of dogs (7)
I believe the answer is:
poodles
'dogs' is the definition.
(poodle is a kind of dog)
'leader of pack with lots' is the wordplay.
'leader of' says to take the initial letters.
'with' says to put letters next to each other.
'lots' becomes 'oodles' (informal term for a large amount).
The first letter of 'pack' is 'p'.
'p'+'oodles'='POODLES'
'of' is the link.
(Other definitions for poodles that I've seen before include "Lackeys" , "Dogs in old pose" , "Curly-coated dogs" .)