Usually if one has to construe difficult punctuation, the sentence should be rewritten.
"Phil, the weatherman's, shadow could be seen as his impression of his importance in the world -- casting a long shadow and so forth."
Weatherman Phil's shadow ... The shadow of Phil the weatherman ...Since the appositive of Phil is weatherman, one might also write, " The weatherman's, that is, Phil's, shadow ..."
Sorry if this has already been covered. Just starting to read posts today.
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