Invest in gold with commercial backing first (6)
I believe the answer is:
ordain
'invest' is the definition.
(I've seen this before)
'in gold with commercial backing first' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'with commercial' becomes 'ad' (I am not sure about the 'with' bit.**).
'backing' is a reversal indicator.
'first' is a charade indicator (letters next to each other).
'ad' back-to-front is 'da'.
'or'+'da'='orda'
'in' put after 'orda' is 'ORDAIN'.
Can you help me to learn more?
(Other definitions for ordain that I've seen before include "Decree and admit to holy orders" , "Consecrate as priest" , "Initiate as priest" , "Decree or appoint to priesthood" , "Establish" .)