Is Peter about to have an interval of rest (7)
I believe the answer is:
respite
'rest' is the definition.
(synonyms)
'is peter about' is the wordplay.
'about' indicates anagramming the letters.
'is'+'peter'='ispeter'
'ispeter' is an anagram of 'RESPITE'.
'to have an interval of' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for respite that I've seen before include "Pause; reprieve" , "Temporary break" , "A lull" , "Period of relief (from unpleasant thing)" , "Short period of rest" .)