Crossword Genius

Shell explodes twice, bringing police (4)

Ross

I believe the answer is:

plod

'police' is the definition.
Although both the answer and definition are verbs in their base form, I cannot see how one could define the other.

'shell explodes twice' is the wordplay.
'PLOD' is hidden in amongst the letters.
However, I am unsure how this is indicated.

'bringing' acts as a link.

(Other definitions for plod that I've seen before include "Trudge wearily" , "grind away" , "Copper" , "Work (or walk) laboriously" , "Fuzzy type" .)

I've seen this clue in The Times.
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