Take pressure off one of The Blues to kick back?
I believe the answer is:
settle down
'kick back?' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how they can define each other.
'take pressure off one of the blues' is the wordplay.
I cannot really understand how this works, but
'take' could be 'set' (setting is a kind of taking) and 'set' is found within the answer.
'of' could be 'o' and 'o' is found within the answer.
This may be the basis of clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for settle down that I've seen before include "Become quiet and orderly" , "put down roots" .)