Lots for parking loaned buggy, at last (6)
I believe the answer is:
plenty
'lots' is the definition.
(I've seen this before)
'parking loaned buggy at last' is the wordplay.
'parking' becomes 'p' (abbreviation on road signs).
'loaned' becomes 'lent' ('lend' can be a synonym of 'loan').
'at last' says to take the final letters.
The final letter of 'buggy' is 'y'.
'p'+'lent'+'y'='PLENTY'
'for' acts as a link.
(Other definitions for plenty that I've seen before include "A full supply - lots" , "Copiousness" , "Amplitude or abundance" , "Masses" , "More than enough" .)