Desired to be relieved of pressure, so turned over in bed (4)
I believe the answer is:
hoed
'turned over in bed' is the definition.
Although both the answer and definition are past participle verbs, I don't see how one could define the other.
'desired to be relieved of pressure' is the wordplay.
'desired' becomes 'hoped' ('hope' can be a synonym of 'desire').
'to be relieved of' is a deletion indicator.
'pressure' becomes 'p' (abbreviation).
'hoped' with 'p' taken out is 'HOED'.
'so' is the link.
Can you help me to learn more?
(Other definitions for hoed that I've seen before include "Weeded" , "Tended to soil" .)