Gallery on board after controller returns to former position (10)
I believe the answer is:
reinstates
'board after controller returns to former position' is the definition.
I can't tell whether this defines the answer.
'gallery on' is the wordplay.
I cannot really understand how this works, but
'gallery' could be 'tate' (Tate Modern, Tate Britain etc) and 'tate' is located in the answer.
'on' could be 're' ('on' can be mean 'with reference to') and 're' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for reinstates that I've seen is " Re-establishes".)