In a way, she's built like Otto (4)
I believe the answer is:
anna
'otto' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I can't see?
'in a way she's built' is the wordplay.
'in' is an insertion indicator.
'a' becomes 'an'.
'way' becomes 'n' (Compass direction - North).
'she's built' becomes 'a' (I can't justify this - if you can you should give a lot more credence to this answer).
'an' going around 'n' is 'ann'.
'ann'+'a'='ANNA'
'like' is the link.
Can you help me to learn more?
(Other definitions for anna that I've seen before include "Girl - old Indian coin" , "copper, once, in India" , "___ Pavlova, Russian dancer, d. 1931" , "Dame -- Neagle" , "Old Indian coin - girl's name" .)