Had one's sleep disturbed by the pest round the corner! (5)
I believe the answer is:
'had one's sleep' is the definition.
The answer and definition can be both related to bodily activities as well as being past participle verbs.
Maybe you can see a link between them that I can't see?
'disturbed by the pest round the corner' is the wordplay.
'disturbed by' indicates anagramming the letters (inserted letters disturb or break up the word).
'round' indicates putting letters inside.
'the corner' becomes 'l' (I can't justify this - if you can you should give a lot more credence to this answer).
'pest' with letters rearranged gives 'sept'.
'sept' going around 'l' is 'SLEPT'.
Can you help me to learn more?
(Other definitions for slept that I've seen before include "Had room for" , "appeared still" , "Napped, dozed" , "Was dormant" , "Snoozed" .)