Stop disheartened and study range (6)
I believe the answer is:
'range' is the definition.
'stop disheartened and study' is the wordplay.
'disheartened' suggests removing the centre.
'and' says to put letters next to each other.
'study' becomes 'read' ('read' can be a synonym of 'study').
'stop' with its middle removed is 'sp'.
(Other definitions for spread that I've seen before include "Stretch out; big meal" , "Broadcast" , "Stretch out; large meal" , "Sort of betting" , "Special display" .)