Seats on the front and back of garden tree (5)
I believe the answer is:
rowan
'tree' is the definition.
(type of tree)
'seats on the front and back of garden' is the wordplay.
'seats on' becomes 'row' (I can't explain this - if you can you should give a lot more credence to this answer).
'the front' indicates taking the first letters.
'back of' suggests the final letters.
The initial letter of 'and' is 'a'.
The last letter of 'garden' is 'n'.
'row'+'a'+'n'='ROWAN'
Can you help me to learn more?
(Other definitions for rowan that I've seen before include "Mountain-ash" , "The mountain ash tree" , "Tree with orange-red berry-like fruits" , "Tree - archbishop" , "Man" .)