Delighted when record rise took the pressure off (7)
I believe the answer is:
pleased
'delighted' is the definition.
(similar in meaning)
'record rise took the pressure off' is the wordplay.
'record' becomes 'L-P' (abbreviation for long play record).
'rise' shows that the letters should be reversed in order.
'took the pressure off' becomes 'eased' (I can't justify this - if you can you should believe this answer much more).
'lp' back-to-front is 'pl'.
'pl'+'eased'='PLEASED'
'when' is the link.
Can you help me to learn more?
(Other definitions for pleased that I've seen before include "Grateful, delighted" , "Glad" , "like Punch?" , "Well satisfied" , "Euphoric" .)