Disheartened steel worker's opinion? (5)
I believe the answer is:
slant
'opinion?' is the definition.
(I've seen this in another clue)
'disheartened steel worker's' is the wordplay.
'disheartened' means to remove the middle letters.
'worker' becomes 'ant' (worker is a type of ant).
'steel' with its centre taken out is 'sl'.
'sl'+'ant'='SLANT'
(Other definitions for slant that I've seen before include "Viewpoint; slope" , "Angle; incline" , "Angle; make oblique" , "Slope - bias" , "Lean, point of view" .)