Involve standing in a row at the centre (6)

I believe the answer is:

entail

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'involve' is the definition.
(entail means to involve or require)

'standing in a row at the centre' is the wordplay.
'standing in' becomes 'ent' (I can't explain this - if you can you should believe this answer much more).
'row' becomes 'file' (I've seen this in another clue).
'at the centre' says to take the centre.
The central letters of 'file' are 'il'.
'ent'+'a'+'il'='ENTAIL'

Can you help me to learn more?

(Other definitions for entail that I've seen before include "Estate settled" , "Involve or necessitate" , "Cause" , "Invlove or necessitate" , "Late in (anag.)" .)

I've seen this clue in the Evening Standard.

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