Delay coming back with mineral - there's a lot of it (6)
I believe the answer is:
galore
'a lot of it' is the definition.
I can't judge whether this definition defines the answer.
'delay coming back with mineral' is the wordplay.
'delay' becomes 'lag' (lag is a kind of delay).
'coming back' says the letters should be written backwards.
'with' is a charade indicator (letters next to each other).
'mineral' becomes 'ore' (ore is a kind of mineral).
'lag' back-to-front is 'gal'.
'gal'+'ore'='GALORE'
'there's' is the link.
Can you help me to learn more?
(Other definitions for galore that I've seen before include "Lots of" , "Lo, Reg, a change could be in abundance" , "to spare" , "Existing in great numbers" , "In profusion" .)