Being exposed in the sun, perhaps, they can get a bit of a red back (5)
I believe the answer is:
nudes
'get a bit of a red back' is the definition.
I can't judge whether this definition defines the answer.
'being exposed in the sun perhaps they' is the wordplay.
'being exposed in' means one lot of letters goes inside another.
'perhaps' indicates anagramming the letters.
'they' becomes 'de' (I can't justify this - if you can you should give a lot more credence to this answer).
'sun' is an anagram of 'nus'.
'nus' placed around 'de' is 'NUDES'.
'can' acts as a link.
Can you help me to learn more?
(Other definitions for nudes that I've seen before include "Revealing paintings?" , "Dunes (anag.)" , "They're uncovered" , "Unclothed people" , "People without clothes on" .)