Spot E. Morse (in first of detective books) (3)

I believe the answer is:

dot

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'spot e morse' is the definition.
'dot' can be an answer for 'spot' (I've seen this before). I'm not sure about the 'e morse' bit.

'first of detective books' is the wordplay.
'first of detective' becomes 'd' (1st letter of 'detective').
'books' becomes 'OT' (abbreviation for Old Testament).
'd'+'ot'='DOT'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for dot that I've seen before include "Very small circular shape" , "'Spot, tiny mark (3)'" , "A point, small round mark" , "Little girl" , "One of the signals in Morse code" .)

I've seen this clue in The Times.

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