Occasionally signed out building material for reward (10)

'reward' is the definition.
(thesaurus)

'occasionally signed out building material' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'building material' becomes 'cement' (cement is a kind of building material).
'signed'+'out'='signedout'
The alternating letters of 'signedout' are 'indu'.
'indu'+'cement'='INDUCEMENT'

'for' is the link.