Procedure in hospital for removing splinters perhaps (6)
I believe the answer is:
planer
'procedure' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'in hospital for removing splinters perhaps' is the wordplay.
I cannot really see how this works, but
'in hospital' could be 'er' (I've seen this in other clues) and 'er' is located in the answer.
The remaining letters 'plan' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for planer that I've seen is " Carpenter sometimes".)