Plenty of dogs free from lead (6)
I believe the answer is:
oodles
'plenty' is the definition.
(I've seen this before)
'dogs free from lead' is the wordplay.
'dogs' becomes 'poodles' (poodle is a kind of dog).
'free from lead' means to remove the first letter (the letter which leads the word is removed).
'poodles' with its first letter taken off is 'OODLES'.
'of' is the link.
(Other definitions for oodles that I've seen before include "A lot" , "'Loads, lots (6)'" , "Plenty" , "wealth" , "Tons, scads" .)