Therapeutic massage — it has relaxed us in retirement (7)
I believe the answer is:
shiatsu
'therapeutic massage' is the definition.
(shiatsu is a type of Japanese massage)
'it has relaxed us in retirement' is the wordplay.
'relaxed' is an anagram indicator.
'in retirement' shows that the letters should be reversed in order (retire can mean to go back or backwards).
'us' written backwards gives 'su'.
'it'+'has'='ithas'
'ithas' is an anagram of 'shiat'.
'shiat'+'su'='SHIATSU'
(Other definitions for shiatsu that I've seen before include "Japanese therapy that uses acupressure" , "Touchy-feely service" , "Japanese healing massage technique" , "Form of treatment that entails pressure with the fingers on specific points on the body" , "Japanese treatment that uses acupressure" .)