Is Heather after a girl from Ireland? (7)

I believe the answer is:

aisling

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'is heather after a girl from ireland?' is the definition.
I can't tell whether this defines the answer.

'is heather after a' is the wordplay.
'heather' becomes 'ling' (synonyms).
'after' says to put letters next to each other.
'is'+'ling'='isling'
'isling' put after 'a' is 'AISLING'.

Can you help me to learn more?

(Another definition for aisling that I've seen is " Dream".)

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