Timeless photo capturing a king in military headgear (5)

I believe the answer is:

shako

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'military headgear' is the definition.
(I've seen this in another clue)

'timeless photo capturing a king' is the wordplay.
'timeless photo' becomes 'sho' (I can't justify this - if you can you should believe this answer much more).
'capturing' indicates putting letters inside.
'king' becomes 'K' (chess abbreviation).
'a'+'k'='ak'
'sho' going around 'ak' is 'SHAKO'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for shako that I've seen before include "Tall military cap" , "soldier's headgear" , "One covering for military head" , "hat from soldier" , "Plumed military cap" .)

I've seen this clue in The Times.

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