Rib uncle being clumsy with item of cutlery, fork-like utensil (8,5)
I believe the answer is:
runcible spoon
'fork-like utensil' is the definition.
'rib uncle being clumsy with item of cutlery' is the wordplay.
'being clumsy' is an anagram indicator.
'with' means one lot of letters go next to another.
'item of cutlery' becomes 'spoon' (I've seen this before).
'rib'+'uncle'='ribuncle'
'ribuncle' with letters rearranged gives 'runcible'.
'runcible'+'spoon'='RUNCIBLE SPOON'
(Other definitions for runcible spoon that I've seen before include "tool for dealing with 1 [QUINCE]" , "Lear's implement" , "Edward Lear's fork" , "Curved fork with three prongs" , "Newlyweds' odd utensil" .)