Sorts out getting round perches (6)
I believe the answer is:
roosts
'perches' is the definition.
(I know this)
'sorts out getting round' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'getting' means one lot of letters goes inside another.
'round' becomes 'o' (round can mean a round object).
'sorts' is an anagram of 'rosts'.
'rosts' placed around 'o' is 'ROOSTS'.
(Other definitions for roosts that I've seen before include "Perches like the birds" , "Of bird, settles for sleep" , "where people settled?" , "Perches for domestic fowl" , "'Rests on a perch, like a chicken (6)'" .)