Every so often, turns head to uncover it (5)
I believe the answer is:
unhat
'uncover it' is the definition.
I know nothing about this answer so I can't tell whether this works.
'every so often turns head to' is the wordplay.
'every so often' means one should take alternating letters.
'turns'+'head'+'to'='turnsheadto'
The alternate letters of 'turnsheadto' are 'UNHAT'.
Can you help me to learn more?
(Other definitions for unhat that I've seen before include "Remove headgear" , "Lift the lid!" , "Remove cap" .)