21 across
Groovy
chassis
on
a
jalopy
(4)
Groovy chassis on a jalopy (4)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
jalopy is the definition, a beaten-up old car. Take HEP for 'groovy' and slip 'a' inside it (the 'on' here works as a containment indicator), splitting HEP into HE and P around the A to give HEAP.