Topic has Labour developing fear of being hemmed in (14)

I believe the answer is:

claustrophobia

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'fear of being hemmed in' is the definition.
I can't tell whether this defines the answer.

'topic has labour developing' is the wordplay.
'developing' is an anagram indicator (letters developed into a new form).
'topic'+'has'+'labour'='topichaslabour'
'topichaslabour' is an anagram of 'CLAUSTROPHOBIA'.

Can you help me to learn more?

(Other definitions for claustrophobia that I've seen before include "major worry over space" , "feeling of being badly stuck in a corner?" , "Fear of confinement" , "Fear of confined spaces" .)

I've seen this clue in The Times.

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