Offer no resistance - it's not difficult to avoid stress (4,2,4)
I believe the answer is:
take it easy
'avoid stress' is the definition.
I can't judge whether this definition defines the answer.
'offer no resistance it's not difficult' is the wordplay.
'offer no resistance' becomes 'take it' (I've seen this in another clue).
'it's not difficult' becomes 'easy' ('easy' is the opposite to 'difficult').
'takeit'+'easy'='TAKE IT EASY'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for take it easy that I've seen before include "Avoid stress - remain calm" , "Lighten up" , "avoid exertion" , "Put your feet up" , "Relax" .)