Crossword Genius

Run round second base (she'll never strike) (5)

Ross

I believe the answer is:

nurse

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'she'll never strike' is the definition.
I can't tell whether this definition defines the answer.

'run round second base' is the wordplay.
'round' is a reversal indicator.
'second' becomes 's' (common abbreviation).
'base' becomes 'e' (Euler's number - base of natural logarithms).
'run' back-to-front is 'nur'.
'nur'+'s'+'e'='NURSE'

Can you help me to learn more?

(Other definitions for nurse that I've seen before include "Care for the sick" , "Nanny" , "Suckle" , "Hospital worker" , "Cherish" .)

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