Bottom on turf, great tackle (4)

I believe the answer is:

face

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'tackle' is the definition.
(thesaurus)

'bottom on turf great' is the wordplay.
'bottom on turf' becomes 'f' (I can't explain this - if you can you should believe this answer much more).
'great' becomes 'ace' (I've seen this before).
'f'+'ace'='FACE'

Can you help me to learn more?

(Other definitions for face that I've seen before include "set of features" , "'Cheeks, mouth, eyes etc (4)'" , "Confront - mug (slang)" , "Watch's dial" , "Countenance, visage" .)

I've seen this clue in The Guardian.

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