Awkward bum must head for bingo hall (3,6)
I believe the answer is:
all thumbs
'awkward' is the definition.
(someone described as 'all thumbs' is clumsy)
'bum must head for bingo hall' is the wordplay.
'bum' indicates an anagram (bum can mean faulty or wrong).
'head for' suggests taking the first letters.
The first letter of 'bingo' is 'b'.
'must'+'b'+'hall'='mustbhall'
'mustbhall' is an anagram of 'ALL THUMBS'.
(Other definitions for all thumbs that I've seen before include "Manually clumsy, too many large digits" , "Manually clumsy from digital aberration" , "ham-fisted" , "Manually clumsy, fingers too short and thick" , "Manually clumsy, awkward at handling things" .)