Nominally, she may seem to have dropped an H (4)

'have dropped an h' is the definition.
The definition suggests a singular noun which matches the answer.

'nominally she may seem' is the wordplay.
I cannot quite see how this works, but
'she' could be 'ara' and 'ara' is found within the answer.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?