Be frightened under cars being repaired (3,6)
I believe the answer is:
run scared
'cars being repaired' is the definition.
I can't tell whether this defines the answer.
'be frightened under' is the wordplay.
'be' becomes 'run' (running is a kind of being).
'frightened' becomes 'scared' (scared means frightened or fearful).
'under' means one lot of letters go next to another (in a down clue, some letters go below others).
'run'+'scared'='RUN SCARED'
Can you help me to learn more?
(Another definition for run scared that I've seen is " Show great fear".)