Caught in their awful clutches more than once (6)
I believe the answer is:
thrice
'clutches more than once' is the definition.
I can't tell whether this defines the answer.
'caught in their awful' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'in' indicates putting letters inside.
'awful' indicates an anagram.
'their' anagrammed gives 'thrie'.
'c' inserted into 'thrie' is 'THRICE'.
Can you help me to learn more?
(Other definitions for thrice that I've seen before include "Archaic word for three times" , "Several times" , "Once, once more and yet once more" , "In threefold degree" , "as it can be found in little titbits" .)