Giving guidance, it's field is in Bucks (6)
I believe the answer is:
beacon
'giving guidance' is the definition.
'beacon' can be an answer for 'guidance' (I've seen this before). I'm not certain of the 'giving' bit.
'field is in bucks' is the wordplay.
I cannot quite understand how this works, but
'is' could be 'be' and 'be' is found within the answer.
This explanation may well be incorrect...
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for beacon that I've seen before include "Warning or guiding device" , "Navigational guide" , "Signal fire - signalling buoy" , "Warning light on hilltop" , "Warning, guiding, fire" .)