Club's striker trying Shearer's headers and angles (6)
I believe the answer is:
facets
'angles' is the definition.
The definition and answer can be both related to thinking as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'club's striker trying shearer's headers' is the wordplay.
'club's striker' becomes 'face' (I can't justify this - if you can you should believe this answer much more).
'headers' indicates taking the first letters (I've seen 'header' mean this (in a down clue, the letter at the top of the word)).
The initial letters of 'trying shearers' is 'ts'.
'face'+'ts'='FACETS'
'and' is the link.
Can you help me to learn more?
(Other definitions for facets that I've seen before include "Faces of cut gemstones" , "Sides or surfaces" , "Surfaces or aspects" , "Sides of a cut gemstone" , "Surfaces of a cut gem" .)