Heading for farm, more unusual cattle feed (6)
I believe the answer is:
fodder
'cattle feed' is the definition.
'fodder' can be an answer for 'feed' (fodder is a kind of feed). I am not certain of the 'cattle' bit.
'heading for farm more unusual' is the wordplay.
'heading for' suggests taking the first letters.
'more unusual' becomes 'odder' ('odd' can be similar in meaning to 'unusual').
The initial letter of 'farm' is 'f'.
'f'+'odder'='FODDER'
Can you help me to learn more?
(Other definitions for fodder that I've seen before include "Food for animals" , "Straw to eat" , "Lucerne etc" , "Food for horses or cattle" , "Bulk feed for livestock" .)