Single nest spotted in run around island (8)
I believe the answer is:
trinidad
'island' is the definition.
(I know that Trinidad is an island)
'single nest spotted in run around' is the wordplay.
'single' becomes 'i' (one).
'nest' becomes 'nid' (I've seen this in another clue).
'spotted in' indicates putting letters inside.
'run around' becomes 'trad' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'i'+'nid'='inid'
'inid' put within 'trad' is 'TRINIDAD'.
Can you help me to learn more?
(Other definitions for trinidad that I've seen before include "Caribbean island" , "Island linked to Tobago" , "West Indian island paired with Tobago" , "West Indies island" , "W. I. island" .)