Came across old shot of just the top of a face (7)

I believe the answer is:

metopic

'of just the top of a face' is the definition.
(relating to the forehead)

'came across old shot' is the wordplay.
'came across' becomes 'met' (to come across is to meet or encounter).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'shot' becomes 'pic' (I've seen this in another clue).
'met'+'o'+'pic'='METOPIC'

(Another definition for metopic that I've seen is " Relating to the forehead".)

I've seen this clue in The Times.

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