Sticking together he said no changes are needed (8)
I believe the answer is:
adhesion
'sticking together he' is the definition.
'adhesion' can be an answer for 'sticking' (I've seen this before). I'm not sure about the 'together he' bit.
'said no changes are needed' is the wordplay.
'changes' is an anagram indicator.
'are' becomes 'he' (I can't justify this - if you can you should give a lot more credence to this answer).
'needed' indicates putting letters inside.
'said'+'no'='saidno'
'saidno' with letters rearranged gives 'adsion'.
'adsion' going around 'he' is 'ADHESION'.
Can you help me to learn more?
(Other definitions for adhesion that I've seen before include "He's no aid to sticker" , "Sticking fast" , "Process of sticking together" , "The property of sticking" , "steady attachment" .)