Colour of old church, not quite red (5)
I believe the answer is:
ochre
'colour' is the definition.
(ochre is a kind of colour)
'old church not quite red' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'church' becomes 'ch' (common abbreviation).
'not quite' means to remove the last letter.
'red' with its last letter taken off is 're'.
'o'+'ch'+'re'='OCHRE'
'of' acts as a link.
(Other definitions for ochre that I've seen before include "Earth coloured pigment" , "Money" , "An orangey pigment" , "Orange" , "Earthy colour" .)