Perhaps Betty Moon? Heads up for plant needed to get well (3,3)
I believe the answer is:
oil rig
'plant needed to get well' is the definition.
(ie a plant needed to drill a well)
'perhaps betty moon? heads up' is the wordplay.
'perhaps betty' becomes 'girl'.
'moon?' becomes 'io' (moon of Jupiter).
'heads up' shows that the letters should be reversed in order.
'girl'+'io'='girlio'
'girlio' reversed gives 'OIL-RIG'.
'for' acts as a link.
(Other definitions for oil rig that I've seen before include "Fuel well" , "Well drilling plant" , "'Structure for drilling (3,3)'" , "used by a bore" , "source of offshore wealth" .)