Better shears cutting coat of ewe (7)
I believe the answer is:
eclipse
'better' is the definition.
'shears cutting coat of ewe' is the wordplay.
'shears' becomes 'clips'.
'cutting' is an insertion indicator (some letters cut their way into a word).
'coat of' suggests removing the centre.
'ewe' with its centre removed is 'ee'.
'clips' inserted into 'ee' is 'ECLIPSE'.
(Other definitions for eclipse that I've seen before include "Astronomical event" , "dark?" , "Obscure light from (other celestial body)" , "concealment" , "The blotting out of a heavenly body" .)