jono and chrise
Re 15a: unlike chrise, I took ‘Spenser’s miscalled’ to be the definition, and ‘return of serve’ to be the cryptic part. ‘Serve’’ as the definition would fit the crossers as well, but that’s not how the clue works.
The solution is an archaic meaning of ‘mistook’ as used, for example, by Spenser in The Faerie Queene.