Where you'd find many layers of yellow on drive (7,3)
I believe the answer is:
chicken run
'where you'd find many layers' is the definition.
(hens are 'layers' - they lay eggs)
'yellow on drive' is the wordplay.
'yellow' becomes 'chicken' (as in cowardly).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'drive' becomes 'run' (synonyms).
'chicken'+'run'='CHICKEN-RUN'
'of' is the link.
(Other definitions for chicken run that I've seen before include "Enclosure for fowls - flight from marginal seats!" , "Animated film - flight to safe seat" , "Enclosure, source of free range eggs" , "Where fowls are kept" .)