Show Havering and Barking tried closing hospital (6)

I believe the answer is:

dither

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'show havering' is the definition.
The definition suggests a singular noun which matches the answer.

'barking tried closing hospital' is the wordplay.
'barking' is an anagram indicator (I've seen this in other clues).
'closing' is an insertion indicator ('closing' can also mean 'enclosing').
'hospital' becomes 'h'.
'tried' is an anagram of 'diter'.
'diter' going around 'h' is 'DITHER'.

'and' is the link.

Can you help me to learn more?

(Other definitions for dither that I've seen before include "Waver, be indecisive" , "'Vacillate, hesitate (6)'" , "Be indecisive, hesitate" , "trembling condition" , "Faff about" .)

I've seen this clue in The Independent.

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