Period of growth bound to restrict having millions saved (10)
I believe the answer is:
springtime
'period' is the definition.
(springtime is a kind of period)
'growth bound to restrict having millions saved' is the wordplay.
I cannot really see how this works, but
'bound' could be 'spring' (both can mean to leap) and 'spring' is present in the answer.
'millions' could be 'm' (abbreviation) and 'm' is found within the answer.
'restrict' could be 'tie' (tying is a kind of restricting) and 'tie' is found within the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for springtime that I've seen before include "Growing season" , "Season loved by lovers" , "When trees are budding" , "era of promise" .)