25 across
Fellow
sadly
wrong
about
spring
as
source
of
amphibians
(9)
Fellow sadly wrong about spring as source of amphibians (9)
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The definition is at the end of the clue.
How the clue works
Source of amphibians is your definition. You've got F for fellow, then an anagram of WRONG (that's your "sadly") giving you ROGWN, which wraps around SPA (a spring) to make ROG(SPA)WN — stick the F on the front and there it is.