Spanish football side, big guns regularly failing, change formation (7)

I believe the answer is:

realign

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'spanish football side big guns regularly failing change formation' is the definition.
I can't tell whether this defines the answer.

'spanish football side big guns regularly' is the wordplay.
'spanish football side' becomes 'real' (I can't explain this - if you can you should give a lot more credence to this answer).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'big'+'guns'='bigguns'
The alternate letters of 'bigguns' are 'ign'.
'real'+'ign'='REALIGN'

Can you help me to learn more?

(Other definitions for realign that I've seen before include "Arrange again" , "Change to a different state or position" , "Apply" , "new dressing" , "Again order" .)

I've seen this clue in The Times.

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