Cattle sector is developing study of fields? (14)

I believe the answer is:

electrostatics

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'study of fields?' is the definition.
The definition suggests a singular noun which matches the answer.

'cattle sector is developing' is the wordplay.
'developing' indicates an anagram (letters developed into a new form).
'cattle'+'sector'+'is'='cattlesectoris'
'cattlesectoris' is an anagram of 'ELECTROSTATICS'.

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(Other definitions for electrostatics that I've seen before include "Science dealing with charges and fields" , "Branch of science dealing with charges" .)

I've seen this clue in The Daily Mail.

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