In summer, Cyprus hides compassion (5)
I believe the answer is:
mercy
'compassion' is the definition.
(I know that mercy is a type of compassion)
'in summer cyprus hides' is the wordplay.
'in' indicates the answer is hidden within the clue.
'MERCY' is hidden within 'summer cyprus hides'.
(Other definitions for mercy that I've seen before include "Pity" , "Compassion or forgiveness" , "Shakespeare 'The quality of . . . . . is not strained'" , "'The quality of ... is not strained' (The Merchant of Venice)" , "Compassion for the unfortunate" .)