Oh dear, less effective tool than a pitchfork, by the sound of it? (5-2)
I believe the answer is:
heigh-ho
'oh dear' is the definition.
(both are said in recognition of a problem)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for heigh-ho that I've seen before include "''... ... it's home from work we go'' (Snow White and the 7 Dwarfs)" , "Weary exclamation" , "Tired expression" , "Expression of resignation or boredom" , "Expression of weariness" .)