Hesitancy from wild one regularly feeding by sierra (9)

'hesitancy' is the definition.
The answer and definition can be both feelings as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'wild one regularly feeding by sierra' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'feeding' means one lot of letters goes inside another (one word is fed by another set of letters).
'by' becomes 'times' ('times' can mean multiplied by).
'sierra' becomes 'S' (phonetic alphabet: alpha, bravo, charlie etc.).
'wild'+'one'='wildone'
The alternate letters of 'wildone' are 'idn'.
'idn' put into 'times' is 'timidnes'.
'timidnes'+'s'='TIMIDNESS'

'from' is the link.

Can you help me to learn more?