Great fear about being caught by father (5)
I believe the answer is:
dread
'great fear' is the definition.
(I've seen this before)
'about being caught by father' is the wordplay.
'about' becomes 're' (regarding).
'being caught by' is an insertion indicator.
'father' becomes 'dad' (dad is a kind of father).
're' placed into 'dad' is 'DREAD'.
(Other definitions for dread that I've seen before include "Be scared of" , "Affright" , "Fearful expectation" , "alarm" , "Anticipate fearfully" .)