Got rid of last of liquid, having had a skin irritation (7)
I believe the answer is:
ditched
'got rid of' is the definition.
(I've seen this before)
'last of liquid having had a skin irritation' is the wordplay.
I cannot really understand how this works, but
'last' could be 't' (I've seen this in other clues) and 't' is found in the answer.
'had' could be 'd' (in contractions e.g. 'I'd', 'you'd' etc) and 'd' is found in the answer.
The remaining letters 'iched' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for ditched that I've seen before include "Of plane, made forced landing on sea" , "Dumped" , "Got rid of" , "Left in the lurch or landed plane in sea" .)