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 quite 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 located in the answer.
'restrict' could be 'tie' (tying is a kind of restricting) and 'tie' is present in the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'of' is the 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" .)