Heads turned after tabloid shows star's blemish (7)
I believe the answer is:
sunspot
'star's blemish' is the definition.
'sunspot' can be an answer for 'blemish' (I have seen 'Solar blemish ' mean 'sunspot' so perhaps 'blemish' could also mean 'sunspot'). I am unsure of the 'star's' bit.
'heads turned after tabloid' is the wordplay.
'heads' becomes 'tops'.
'turned' shows that the letters should be reversed in order.
'after' is a charade indicator (letters next to each other).
'tabloid' becomes 'Sun' (The Sun, UK newspaper).
'tops' backwards is 'spot'.
'spot' put after 'sun' is 'SUNSPOT'.
'shows' is the link.
Can you help me to learn more?
(Other definitions for sunspot that I've seen before include "Cool solar area" , "Solar surface blemish" , "warm place" , "cause of magnetic storm" , "Solar dark patch" .)