Supporters gathering around the last for Tiger Woods (5)
I believe the answer is:
trees
'woods' is the definition.
(woods are made up of trees)
'supporters gathering around the last for tiger' is the wordplay.
'supporters gathering' becomes 'tees' (I can't explain this - if you can you should give a lot more credence to this answer).
'around' is an insertion indicator.
'the last for' suggests the final letters (back).
The final letter of 'tiger' is 'r'.
'tees' going around 'r' is 'TREES'.
(Other definitions for trees that I've seen before include "Tall, perennial, woody plant" , "Large plants" , "Ashes, perhaps?" , "Woods" , "Steer into the plants" .)