In that case, you may take a rest (8,3)
I believe the answer is:
sleeping bag
'in that case you' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'take a rest' is the wordplay.
I cannot quite see how this works, but
'take' could be 'bag' (bagging is a kind of taking) and 'bag' is present in the answer.
'rest' could be 'sleeping' (sleeping is a kind of rest) and 'sleeping' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'may' acts as a link.
Can you help me to learn more?
(Other definitions for sleeping bag that I've seen before include "Camper's item" , "Something campers use - e.g. being pals (anag)" , "Camper's warmer" , "Camping equipment" , "Camping item" .)