Like brownish-yellow colour of church and rectory, both empty (5)
I believe the answer is:
ochre
'like brownish-yellow colour' is the definition.
'ochre' can be an answer for 'colour' (ochre is a kind of colour). I'm not certain of the 'like brownish-yellow' bit.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for ochre that I've seen before include "An orangey pigment" , "natural colouring" , "yellowish-red" , "Buff" , "Yellow/brown pigment" .)