Feel uncertainly that Reg maybe out of work (5)
I believe the answer is:
grope
'feel uncertainly that' is the definition.
'grope' can be an answer for 'feel' (I've seen this in another clue). I am not sure about the rest of the definition.
'reg maybe out of work' is the wordplay.
'maybe' indicates an anagram.
'out of' is an insertion indicator (some letters on the outside of others).
'work' becomes 'op' (abbreviation for opus).
'reg' is an anagram of 'gre'.
'gre' going around 'op' is 'GROPE'.
Can you help me to learn more?
(Other definitions for grope that I've seen before include "Feel uncertainly along" , "Search blindly" , "Paw" , "Feel about as in the dark" , "Flounder" .)